Oven system for side-blown smelting furnace

Abstract

The utility model relates to a furnace baking system for a side-blown smelting furnace. The furnace baking system comprises the side-blown smelting furnace, a masonry structure and a furnace baking device, the side blowing smelting furnace comprises a furnace bottom, a slag chamber, a hearth, a siphon opening, a furnace body middle section, a top furnace wall, a flue opening, a hearth masonry, a bottom flat water jacket, a slag chamber partition wall water jacket and a slag discharging opening. The masonry structure comprises an arch mold, arch angle refractory bricks and wedge-shaped refractory bricks. The oven device comprises a combustion nozzle, a temporary temperature monitoring thermocouple and an oven body temperature monitoring device; the masonry structure is an arch masonry, the arch mold is located between two bottom flat water jackets on a hearth masonry, the two sides of the masonry structure are built by arch angle refractory bricks, the middle of the masonry structure is built by wedge-shaped refractory bricks, the end, close to a slag chamber, of the masonry structure is tightly attached to a slag chamber partition wall water jacket, and a space is reserved at the end, close to a siphon opening, of the masonry structure; and the combustion nozzle is arranged in a slag discharge port at the slag chamber and is inclined towards the furnace bottom to form a certain angle.

Description

Technical Field

[0001] The utility model belongs to the technical field of copper pyrometallurgy, and in particular relates to a furnace baking system for a side-blown smelting furnace. Background Art

[0002] The statements in this section are merely intended to provide background information related to the technical solution of the present application to aid understanding, and they do not necessarily constitute prior art for the technical solution of the present application.

[0003] The purpose of furnace baking is to adapt to the thermal expansion law of refractory materials, achieve balanced heat transfer inside and outside the masonry, uniform moisture discharge of refractory materials and mortar in the furnace at an appropriate heating rate and constant temperature, avoid large temperature difference stress in the brick lining, ensure that moisture migration and discharge are always in a balanced state, prevent hydration of alkaline refractory materials due to different gaseous circulations, and avoid spalling due to temperature difference stress, so as to achieve the expected service life of refractory materials.

[0004] At present, the common practice for the furnace body is to implement a single baking. The main parts are the melt area including the furnace bottom, furnace cylinder, slag chamber, siphon port, etc. Due to the large volume of the furnace body, a certain negative pressure will be generated, taking away a large part of the heat. This requires corresponding measures to protect the heat loss. Therefore, the furnace bottom and furnace cylinder must be sealed to lock the heat. Some solutions use steel plates made into arches and installed above the furnace cylinder. However, this will cause some of the arched steel plates to deform and collapse during baking, causing heat loss. The heating curve cannot achieve the expected effect, affecting the service life of the refractory materials. Utility Model Content

[0005] In view of the problems existing in the prior art, the utility model provides a furnace baking system for a side-blown smelting furnace, which is characterized by comprising:

[0006] Side-blown smelting furnace, masonry structure, furnace drying device;

[0007] The side-blown smelting furnace includes a furnace bottom, a slag chamber, a furnace hearth, a siphon port, a middle section of a furnace body, a top furnace wall, a flue port, a furnace hearth masonry, a bottom flat water jacket, a slag chamber partition wall water jacket, and a slag discharge port; the masonry structure includes an arch mold, an arch angle refractory brick, and a wedge-shaped refractory brick; the furnace drying device includes a combustion nozzle, a temporary temperature monitoring thermocouple, and a furnace body temperature monitoring device;

[0008] The masonry structure is an arched masonry, the arch mold is located between the two bottom flat water jackets on the furnace masonry, the two sides of the masonry structure are built with arched refractory bricks, and the middle is built with wedge-shaped refractory bricks, the end of the masonry structure close to the slag chamber is closely attached to the slag chamber partition wall water jacket, and the end of the masonry structure close to the siphon port is reserved with space;

[0009] The combustion nozzle is installed in the slag discharge port at the slag chamber and is inclined toward the furnace bottom to form a certain angle.

[0010] In one embodiment, the corner refractory bricks and the wedge-shaped refractory bricks are lightweight refractory bricks.

[0011] In one embodiment, the width of the reserved space is 500-800 mm.

[0012] In one embodiment, the temporary temperature monitoring thermocouple is multiple.

[0013] In one embodiment, the mouth of the combustion nozzle is made of stainless steel 310S.

[0014] In one embodiment, slag or wrought copper is laid below the injection zone of the combustion nozzle.

[0015] In one embodiment, the arch form is made by welding welded pipes, angle steels or steel plates.

[0016] In one embodiment, the temporary temperature monitoring thermocouple and the furnace temperature monitoring device are connected to the system of the main control room.

[0017] In one embodiment, the side-blown smelting furnace further includes a tuyere water jacket.

[0018] In one embodiment, the temporary temperature monitoring thermocouple is inserted into the masonry structure via the eye water jacket.

[0019] Beneficial effects of the utility model:

[0020] (1) At present, the common practice for the furnace body is to implement a one-time baking. The main parts are the melt area including the furnace bottom, furnace cylinder, slag chamber, siphon port, etc. Due to the large volume of the furnace body, a certain negative pressure will be generated, taking away a large part of the heat. This requires corresponding measures to protect the heat loss. Therefore, the furnace bottom and furnace cylinder must be sealed to lock in the heat. The lightweight refractory brick masonry used in this scheme has achieved the expected effect and significantly improved the life of the furnace body refractory material.

[0021] (2) The method used in the prior art of making steel plates into an arch and installing them above the furnace requires workers to prefabricate a model according to the size of the drawing, make an arch structure according to the width of the steel plate, and then hoist the steel plates into the furnace in blocks for splicing and installation. This solution is more convenient and safe to install, reduces the labor intensity of workers, and saves production costs.

[0022] (3) The furnace baking method adopted in this scheme is that the flame burning from the combustion nozzle passes through the slag chamber into the built arched masonry to reach the siphon mouth end, enters the top furnace wall through the reserved space, and is discharged from the flue port. The heat covers the entire furnace body. Only one combustion nozzle is needed to achieve the expected effect and purpose, which reduces the number of combustion nozzles, saves fuel, and reduces smelting costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The embodiments of the present invention are further described below with reference to the accompanying drawings, wherein:

[0024] Figure 1 is a front view of a furnace system for a side-blown smelting furnace according to one embodiment;

[0025] Figure 2 is a side view of a furnace system for a side-blown smelting furnace according to one embodiment;

[0026] Figure 3 is a top view of a furnace system for a side-blown smelting furnace according to one embodiment;

[0027] Figure 4 is an enlarged side view of a furnace system for a side-blown smelting furnace according to one embodiment;

[0028] Among them, 1 is a side-blown smelting furnace, 2 is a furnace bottom, 3 is a slag chamber, 4 is a furnace hearth, 5 is a siphon port, 6 is a middle section of the furnace body, 7 is a top furnace wall, 8 is a flue port, 9 is a furnace hearth masonry, 10 is a bottom flat water jacket, 11 is a slag chamber partition wall water jacket, 12 is a slag discharge port, 13 is an air eye water jacket, 14 is a masonry structure, 15 is an arch mold, 16 is an arch corner refractory brick, 17 is a wedge-shaped refractory brick, 19 is a combustion nozzle, 20 is a temporary temperature monitoring thermocouple, 21 is a furnace body temperature monitoring device, and 22 is a vertical water jacket. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail through specific embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0030] Reference Figure 1-4 , a furnace drying system for a side-blown smelting furnace, comprising: a side-blown smelting furnace 1, a masonry structure 14, and a furnace drying device.

[0031] The side-blown smelting furnace 1 includes a furnace bottom 2, a slag chamber 3, a furnace cylinder 4, a siphon port 5, a furnace middle section 6, a top furnace wall 7, a flue port 8, a furnace cylinder masonry 9, a bottom horizontal water jacket 10, a slag chamber partition wall water jacket 11, a slag discharge port 12, and a tuyere water jacket 13.

[0032] The masonry structure 14 includes an arch mold 15 , arch corner refractory bricks 16 , and wedge-shaped refractory bricks 17 .

[0033] The oven device comprises a combustion nozzle 19 , a temporary temperature monitoring thermocouple 20 , and a oven body temperature monitoring device 21 .

[0034] In one embodiment, the masonry structure 14 is an arch masonry, and the arch mold 15 is placed between the two bottom flat water jackets 10 above the furnace masonry 9. The masonry can be built from both sides to the middle, with arch corner refractory bricks 16 on both sides and wedge-shaped refractory bricks 17 in the middle. When building the masonry structure 14, it can be built from the slag chamber 3 end to the siphon port 5 end. The end of the masonry structure 14 close to the slag chamber 3 can be close to the slag chamber partition wall water jacket 11, and the end close to the siphon port 5 can reserve space, for example, a space with a width of 500-800 mm.

[0035] In one embodiment, the combustion nozzle 19 is installed in the slag discharge port 12 at the slag chamber 3 and is inclined to the furnace bottom 2 to form a certain angle. The flame burning in the combustion nozzle 19 passes through the slag chamber 3 into the built arched masonry to reach the end of the siphon port 5, and enters the top furnace wall 7 through the reserved space, and then is discharged from the flue port 8. The corresponding type of combustion nozzle can be equipped according to the output of the furnace body.

[0036] In one embodiment, the arch mold 15 is an arch structure, and the length dimension between the bottom flat water jackets 10 on both sides of the furnace is about the width dimension of three refractory bricks. After the drawings of the arch mold 15 are designed, the arch mold 15 can be welded by welding pipes, angle steels, steel plates, etc. During masonry, it can be masoned from the slag chamber 3 to the siphon port 5 end, and the formed arch mold 15 is placed between the two bottom flat water jackets 10 of the slag chamber 3 and is tightly attached to the slag chamber partition wall water jacket 11. The masonry method can be dry masonry, which is a method of masonry from both sides to the middle. Specifically, first place the two right-angle sides of the arch corner refractory bricks 16 on both sides against the vertical water jacket 22 and the bottom flat water jacket 10, then place the wedge-shaped refractory bricks 17 on the inclined surface of the arch corner refractory bricks 16 and align them with the arch corner refractory bricks 16, and place the wedge-shaped refractory bricks 17 according to the thickness on the top and the thinness on the bottom, and place the thin surface on the arch mold 15, and then build an arch in sequence. Because the arch mold 15 is about the width of three refractory bricks, when the three arches are built, move the arch mold 15 to the position of three refractory bricks at the end of the siphon port 5 for the next masonry, and build in sequence to the end of the siphon port 5, and reserve a space of, for example, 500-800mm at the end of the siphon port 5 without masonry, and then take out the arch mold 15 from this space, and the masonry is completed. In one embodiment, the melting temperature of the arch corner refractory bricks and the wedge-shaped refractory bricks is 1250-1300°C. In one embodiment, the arch corner refractory bricks and the wedge-shaped refractory bricks are lightweight refractory bricks. In one embodiment, the masonry structure is a ring masonry.

[0037] In one embodiment, the combustion nozzle 19 is installed in the slag discharge port 12 at the slag chamber 3 and is inclined to the furnace bottom 2 to form a certain angle, so as to allow heat to directly enter the slag chamber 3 and the built arched structure. The furnace drying device is equipped with a temporary temperature monitoring thermocouple 20 and a furnace body temperature monitoring device 21. The temporary temperature monitoring thermocouple 20 and the furnace body temperature monitoring device 21 can be connected to the DCS system of the main control room to display the temperature in the furnace in real time. The temporary temperature monitoring thermocouple 20 can be horizontally inserted into the center line of the furnace body in the furnace masonry structure 14 by the air eye water jacket 13. If there are many air eyes, multiple measuring points can be set according to the position, such as 2-3. The combustion nozzle 19 can be provided with an automatic flow adjustment function, and is associated with the temporary temperature monitoring thermocouple 20 and the furnace body temperature monitoring device 21, so that the flow of the combustion nozzle 19 can be controlled according to the heating curve set in the main control room to achieve automatic control.

[0038] In one embodiment, slag or wrought copper is laid on the furnace bottom 2 below the injection area of ​​the combustion nozzle 19 to prevent local overheating from damaging the furnace bottom 2. The flame burning in the combustion nozzle 19 passes through the slag chamber 3 and enters the built arched masonry structure 14 to reach the end of the siphon port 5, enters the top furnace wall 7 through the reserved space, and is discharged from the flue port 8. The furnace baking method is carried out from important parts to secondary parts according to the principles of furnace body structure and production process, and the order can be furnace bottom 2-slag chamber 3-furnace cylinder 4-siphon port 5-middle section of furnace body 6-top furnace wall 7, and the temperature is also from high to low. This furnace baking method solves this problem well, and has low cost and quick effect.

[0039] In one embodiment, after the furnace is baked according to the heating curve, the furnace start-up stage is entered. When starting the furnace, oxygen-enriched air needs to be blown into the air eye water jacket 13 to assist combustion, and the masonry structure 14 needs to be destroyed before starting the furnace. The arch breaking method is to place a round steel with a diameter of about 70mm horizontally above the large end and the small end of the wedge-shaped refractory brick 17 at the center line of the furnace body after the masonry structure 14 is built and welded into one, and then vertically weld a round steel with a diameter of about 20mm at the top of the center position of the round steel, and lead it out of the furnace and fix it. It is divided into 2-3 parts according to the length direction of the furnace body. When breaking the arch, you only need to pull out the round steel outside the furnace vertically. After the arch breaking is completed, the furnace start-up operation is carried out. When starting the furnace, due to the small density of the light refractory brick, it will melt and float on the upper part of the liquid surface as the solution liquid level rises and the temperature rises, and is discharged with the slag.

[0040] References herein to "various embodiments", "some embodiments", "one embodiment", or "an embodiment" refer to specific features, structures, or properties described in conjunction with the embodiments being included in at least one embodiment. Therefore, the phrases "in various embodiments", "in some embodiments", "in one embodiment", or "in an embodiment" appearing throughout the present invention do not necessarily refer to the same embodiment. In addition, specific features, structures, or properties may be combined in any suitable manner in one or more embodiments. Therefore, specific features, structures, or properties shown or described in conjunction with one embodiment may be combined in whole or in part with features, structures, or properties of one or more other embodiments without restriction, as long as the combination is not illogical or inoperable. Expressions similar to "according to A", "based on A", "through A", or "using A" appearing herein are intended to be non-exclusive, that is, "according to A" may include "according to A only" or "according to A and B", unless it is specifically stated that its meaning is "according to A only". In this application, for the sake of clarity, some exemplary operating steps are described in a certain order, but those skilled in the art will understand that each of these operating steps is not essential, and some of the steps may be omitted or replaced by other steps. These operation steps do not have to be executed sequentially in the manner shown; on the contrary, some of these operation steps can be executed in different orders or in parallel according to actual needs, as long as the new execution manner is not illogical or inoperable.

[0041] Having thus described several aspects of at least one embodiment of the present invention, it will be appreciated that various changes, modifications and improvements will readily occur to those skilled in the art. Such changes, modifications and improvements are intended to be within the spirit and scope of the present invention. Although the present invention has been described by way of some embodiments, the present invention is not limited to the embodiments described herein, and includes various changes and variations made without departing from the scope of the present invention.

Claims

1. A furnace baking system for a side-blown smelting furnace, characterized in that: include: Side-blown smelting furnace, masonry structure, furnace drying device; The side-blown smelting furnace includes a furnace bottom, a slag chamber, a furnace hearth, a siphon port, a middle section of a furnace body, a top furnace wall, a flue port, a furnace hearth masonry, a bottom flat water jacket, a slag chamber partition wall water jacket, and a slag discharge port; the masonry structure includes an arch mold, an arch angle refractory brick, and a wedge-shaped refractory brick; the furnace drying device includes a combustion nozzle, a temporary temperature monitoring thermocouple, and a furnace body temperature monitoring device; The masonry structure is an arched masonry, the arch mold is located between the two bottom flat water jackets on the furnace masonry, the two sides of the masonry structure are built with arched refractory bricks, and the middle is built with wedge-shaped refractory bricks, the end of the masonry structure close to the slag chamber is closely attached to the slag chamber partition wall water jacket, and the end of the masonry structure close to the siphon port is reserved with space; The combustion nozzle is installed in the slag discharge port at the slag chamber and is inclined toward the furnace bottom to form a certain angle.

2. The oven system according to claim 1, characterized in that: The arch angle refractory bricks and the wedge-shaped refractory bricks are lightweight refractory bricks.

3. The oven system according to claim 1, characterized in that: The width of the reserved space is 500-800 mm.

4. The oven system according to claim 1, characterized in that: The temporary temperature monitoring thermocouple is multiple.

5. The oven system according to claim 1, characterized in that: The mouth of the combustion nozzle is made of stainless steel 310S.

6. The oven system according to claim 1, characterized in that: Slag or wrought copper is laid below the injection zone of the combustion nozzle.

7. The oven system according to claim 1, characterized in that: The arch mold is made by welding welded pipes, angle steels or steel plates.

8. The oven system according to claim 1, characterized in that: The temporary temperature monitoring thermocouple and the furnace temperature monitoring device are connected to the system in the main control room.

9. The oven system according to claim 1, characterized in that: The side-blown smelting furnace also includes a tuyere water jacket.

10. The oven system according to claim 9, characterized in that: The temporary temperature monitoring thermocouple is inserted into the masonry structure via the air eye water jacket.

Images